Even with four sticks, it would STILL only be running in DUAL channel. Triple, quad, and higher channel memory architectures are ONLY found on HEDT and other high end platforms. Consumer memory architectures, so far at least, are pretty much always dual channel.
This is not a problem. This is by design. You will simply have MORE memory running in dual channel, ie, 64GB of dual channel operation, rather than just 32GB of dual channel operation.
However, as gskill support has mentioned, four sticks is a lot of stress on the memory controller and it won't always work depending on some variables. Higher end motherboards AND higher end chipsets, tend to offer better chances that four sticks (Especially at high speeds as with 3000mhz and higher speed kits) will run without problems that you have to work through.
Having a CPU that can be overclocked usually helps as well. Better quality, higher end memory kits that use top quality IC's (Memory chips) affect the equation.
But the biggest single factor is usually that all of the memory comes together in a matched set that has been tested to ensure all of the sticks are compatible with each other. Even then, SOMETIMES one of the sticks might not want to play nice with the others on a given motherboard, and the kit might need to be returned and try a different kit. Even the same kit model but a different actual kit can make the difference.
I've seen guys struggle with quad channel kits that come with 8 DIMMs, try everything, turns out ONE stick that does work but does not work WITH all the other sticks, is the problem. Return the kit. New kit. Works fine.
So yes, you can use four DIMMS and they can be in DUAL channel but you want to eliminate as many variables as possible.